Having trouble installing an Android 6.0 Marshmallow or Android 7.0 Nougat custom ROM? Our failproof method for TWRP has worked flawless for many phones on Lollipop but with Marshmallow you may still have FC (force closing) problems when installing a custom ROM.
For those of you who want to install the new Oxygen OS on the OnePlus One Android smartphone, you will first need to root your phone.
To root your OnePlus One, follow our guide on How to Root OnePlus One first then come back to this tutorial.
For those of you who want to install custom ROMs on your Android smartphone or tablet, you will want to certainly learn how to backup and restore ROM. This will work on most Android smartphones with TWRP recovery installed including Galaxy Note 4/3/2/1, S5/S4/S3/S2, Note Edge, HTC One, Nexus 6/5/4/7/10, and many more.